Doesn't sound like fun to me, it sounds stressful! Is it just a particular region?
Not stressful at all Carol. Joan and I park late in a location and move the next morning. We may only move to another spot within walking distance for the day. The Guardia and Local Police patrol at night and spot where vans are parking. If they see you moving around and only parking, then they leave you alone (ie, playing the game). Where the same van is in the same spot for days and nights on end they will move you on and that could cost you up to 400 Euros. Where lots of vans gather they will keep a special eye on that location. We try not to overnight more than two consecutive nights in one place and day park in other spots. It is relatively easy to find locations well away from the hot spots in our experience. You are parking not camping at these locations.
We use Aires and camper stops to get water and dump our toilet. These are not expensive in fact some you only pay for the water used. Others it is cheaper to stay the night and use the dump facility twice that just call in to dump (ie. Calnegre Camper stop). We also use Fuentes for water inland.
As for Ken's idea of a meet. Camper stops such as Auto Caravanas Vera (ACVera on a paddle and tennis complex)) are very cheap if you stay for a few days. Also useful for a
battery top up on EHU. New Year it is always very full there but otherwise there would be bags of space.
The Aire in Cartagena is right opposite EROSKI and there is also a laundrette in the Rembla complex. The Aire offers free parking and toilet dump with water at 2 Euro for 10mins (about 100 litres). An overnight stop here 11pm to 8 am is 10 Euro and you are in a locked compound and EHU. Space for about 10 vans on EHU plus others.
The Camper stop at Los Delores (also near Cartagena) is also very good and offers cheaper rates for more than a few days. Laundry available and very popular with users. Good bus services into Cartagena from both of these locations if you like cities.
We met up with Alan, Bob, Snail, Donna and Phil and others, one Christmas at a beach location, but that has now been fenced off.
Carol, Spain has 17 autonomous regions and each town hall has its own rules and has police to enforce them. Camping anywhere other than on an official caravan site is unlawful in most of Spain, but some regions are not a zealous as other in the enforcement.
Snail and ourselves parked at an empty car park at Torrenostra one evening, and had tickets on our windows in the morning, informing us it was against the local law for motorhomes to park there overnight. We pulled off the car park onto a roadside parking bay on the other side of the road, beside an un-built building plot and were OK. The car park remained empty the whole time we were there. There was boat launching facilities off this car park, but trailers could not be left there either. Local rules enforced by local police.